No frames wfp at all, infact never in 4 years wfp. do the frames look dirty? no. has anyone ever mentioned how the frames are dirty? no. have i ever been asked to clean the frames? no.
I have tried it in the past but it gave me nothing but unreliable results, i'm talking top frame here.
I would if asked of course but would charge extra.
However, i never sold wfp to any customer on clean frames etc, i saw it as making a rod for my own back. I get perfect results & never get a complaint, why should i clean the frame?
Feel free to look through my 2000 back posts & see if you can find one where i have trouble with spots, dirty drips etc! you won't.
Tony