Polishing pads aren't cheap, and the difference between a pad that lasts a season and one that's rubbish after three cars is almost entirely how it's looked after. But the bigger reason to clean your pads isn't the money. It's that a dirty pad doesn't polish properly, and you end up doing extra passes to fix work the pad should have done first time.
Why a clean pad polishes better
Polishing compounds work on a cycle. The abrasives start coarse and cut, then break down under the pad and refine, and by the end of a set they've gone from removing defects to leaving gloss. That cycle only works if the pad face is clear enough for the abrasives to press against the paint.
As you polish, the pad fills with two things: spent compound that's already broken down, and the clear coat you've just removed. Once the face is loaded, fresh compound can't get to the paint. It sits on top of the old residue and smears instead of cutting. The cut drops, the finish goes hazy, and you either reach for a heavier compound you didn't need or go over the panel again. Both waste time and clear coat.
Spurring the pad, clearing the face with a brush or a blast of air, resets that. It takes ten seconds and the next panel gets the same cut as the first one did. It's the single biggest thing that separates a clean correction from a hazy one, and most people who are frustrated with their compounds are actually frustrated with a dirty pad.
Heat is the enemy
The other thing residue does is trap heat. A polishing pad is thousands of tiny cells or fibres, and when those are open, heat from the friction of polishing escapes through them. Clog them with compound and paint dust and it can't.
It gets worse the longer you leave it. The spent compound and clear coat don't stay on the face, they seep into the pad, so a clogged pad clogs faster and runs hotter with every set. Eventually that heat and residue reach the back of the pad, where the foam is glued to the velcro. The glue softens, the velcro delaminates, and the pad lets go of the backing plate. When someone tells us a pad "just fell apart", that's nearly always what happened, and it started with a face that wasn't spurred.
A loaded pad is also heavy. A clean foam pad weighs next to nothing; a clogged one can weigh several times more, and that extra weight runs off-centre on a dual action polisher. The pad gets thrown around, the machine works harder, and the pad stresses in ways it wasn't built for.
Two habits fix it. Spur the pad between sets so the cells stay open and the residue never gets a chance to migrate to the back. And rotate pads rather than trying to do a whole car on one. When a pad feels warm, swap it for a fresh one and let it cool. A pad stack with three or four of each cut is cheaper in the long run than replacing one pad every month because it got cooked.
Cleaning on the fly
Between every panel, or at least every couple of sets, clear the face of the pad without taking it off the machine.
With a brush. Hold a pad brush against the face of the pad and run the polisher on its lowest speed for a few seconds. The bristles lift the spent compound out of the foam and it flicks away. This is spurring, and it's what every detailer does dozens of times a day. A stiff brush like the Wheel Woolies pad brush is built for it.
With air. A blast from an air gun or a Tornador does the same job faster and has the bonus of cooling the pad. If you've got a compressor in the bay, this is the way.
With a pad washer. For volume work, a pad washer is a bucket with a grit grate and a splash guard. You lower the pad in on the machine, spin it against the grate in the cleaning solution, and it comes out clean and damp in seconds. It means you can clean a pad mid job instead of swapping to a fresh one, so a detailer carries six pads instead of twenty.
Cleaning at the end of the day
Spurring keeps a pad working through a job. It doesn't get everything out, and compound left to dry in the pad overnight hardens, the foam goes stiff, and it never cuts evenly again. So every pad gets washed properly once the job's done.
- Soak. Warm water in a bucket with a dedicated pad cleaner like CARPRO MFX, or a light all purpose cleaner dilution, something like Green Star or Zeus Fury. A few minutes is enough to soften the residue.
- Work it. Massage the cleaner into the face of the pad with your fingers or a soft brush. You'll see the water go grey as the compound comes out.
- Rinse. Under warm running water until it runs clear. Squeeze the pad flat between your palms, don't wring it, twisting tears the foam from the velcro.
- Dry. Face up, out of the sun, somewhere with airflow. Never stack wet pads and never leave them face down on the bench.
Two things to keep away from your pads. Dishwashing liquid, which leaves a residue that interferes with how the next compound breaks down. And the washing machine, at least for foam. The spin cycle tears velcro and foam apart. Microfibre pads can go through a gentle cycle with a microfibre detergent like Micro Clean, no fabric softener, but foam gets hand washed.
Foam, microfibre and wool need different care
Foam is the easiest. Spur it, wash it, dry it flat. The thing to watch is the velcro: if the pad ever separates from the backing plate while spinning, it's finished, so check the hook side is clean and the loop side isn't lifting.
Microfibre loads up fastest and holds the most residue, because the fibres trap compound the way foam cells can't. Spur it more often than foam, every panel without fail. After washing, run a brush across the face while it's damp to stand the fibres back up, otherwise it dries matted and cuts unevenly.
Wool sheds and mats. It needs a proper spur with a stiff brush or a pad tool to open the fibres up between sets, and it's the one where an air gun really pays off. Wash it the same as foam but expect to spend longer rinsing, and dry it well away from anything that'll pick up the lint.
When to retire a pad
Pads are consumables. A clean, well looked after foam pad does thirty or forty cars, more if it's a finishing pad that never sees heavy compound. Signs it's done:
- The foam has gone stiff or crumbly and doesn't spring back
- The velcro is lifting at the edge or the pad has separated from its backing
- The edges are torn or the face has a permanent hard patch where residue set in
- It won't clean up, the water stays grey no matter how long you soak it
A pad past its best doesn't just cut worse, it can mark the paint. Bin it.
The pad care kit
You don't need much.
- A pad brush for spurring. The one thing everyone should own.
- A pad cleaner or a light all purpose cleaner for washing.
- An air gun if you've got a compressor, or a pad washer if you're doing enough cars for it to pay for itself.
- Enough pads to rotate. A pad stack is the cheapest way to get there.
Everything above lives in the Pad Cleaning collection. If you're not sure which cleaner suits your pads, get in touch and we'll point you at the right one.
