How to clean WD40 off of bare iron brake discs ?

Fast Eddie · 2026-05-18T03:25:50-0600

What’s the best way to clean bare grey iron discs that have been WD40’d ?

Does WD40 soak into the pores of iron? Or does it just sit on the surface?

Will scrubbing with brake cleaning solvent suffice?

Or should I put them in the dishwasher? Boil them in a saucepan? Or some other ingenious method ??

dobba99 · 2026-05-18T03:39:25-0600

spray and wipe with brake cleaner, job dun

Fast Eddie · 2026-05-18T04:26:44-0600

dobba99 said:
spray and wipe with brake cleaner, job dun

S’wot I wanted to hear !

concours · 2026-05-18T04:41:56-0600

WD40 is mostly solvent, and damn little oil. I use it to clean oil, chain lube, etc.

Then there was this one time at the Bikini Bike Wash in Daytona where the stripper used spray wax on my front rotors....

I didn't stop her.

I figured the sintered bronze pads would carry me through.

dobba99 · 2026-05-18T05:08:26-0600

concours said:
WD40 is mostly solvent, and damn little oil. I use it to clean oil, chain lube, etc.

Then there was this one time at the Bikini Bike Wash in Daytona where the stripper used spray wax on my front rotors....

I didn't stop her.
I figured the sintered bronze pads would carry me through.

That reminds me of when i ground a disc for a commando owner a few years ago, I sprayed it with a rust preventative immediately after grinding (the water based coolant causes discs to rust before your eyes) This rust preventative was akin to Waxoyl. The silly sod just bolted the disc on without cleaning it and then complained his brake didn't work! Needless to say i left him with a flea in his ear with a few choice words about his workmanship!

concours · 2026-05-18T09:55:39-0600

dobba99 said:
That reminds me of when i ground a disc for a commando owner a few years ago, I sprayed it with a rust preventative immediately after grinding (the water based coolant causes discs to rust before your eyes) This rust preventative was akin to Waxoyl. The silly sod just bolted the disc on without cleaning it and then complained his brake didn't work! Needless to say i left him with a flea in his ear with a few choice words about his workmanship!

You can place the whiffle ball on a plastic T for them.... but the slack jaw doofuses still need to swing the plastic bat.

How to clean WD40 off of bare iron brake discs ?

Fast Eddie

dobba99

Fast Eddie

concours

dobba99

concours

Similar threads