I don't think anything gets ACF50 off, other than time,
I ended up with a spot on my front disc years back and it was ages before they worked properly again... did the same in January this year overhauling the calipers, its nothing to stop brake fluid going on paint but ACF 50 seems to have wings.... even though trying to be extra careful. 2 or 3 spots on one disc and even 3 goes with heavy duty brush cleaning thinners and washing the bike does absolutely nothing. 200 miles down the road the brakes still don't work, not that big a deal at this time of year but quite how it manages to stick is incredible, nothing touches it aside from 6 month of time
wd40 would burn off in the first second the pad touched the disc, its basically useless although that said it does a better job than GT40, that stuff lasts about 25 seconds before its nowhere to be seen
I ended up with a spot on my front disc years back and it was ages before they worked properly again... did the same in January this year overhauling the calipers, its nothing to stop brake fluid going on paint but ACF 50 seems to have wings.... even though trying to be extra careful. 2 or 3 spots on one disc and even 3 goes with heavy duty brush cleaning thinners and washing the bike does absolutely nothing. 200 miles down the road the brakes still don't work, not that big a deal at this time of year but quite how it manages to stick is incredible, nothing touches it aside from 6 month of time
wd40 would burn off in the first second the pad touched the disc, its basically useless although that said it does a better job than GT40, that stuff lasts about 25 seconds before its nowhere to be seen