Aceton
I clean with aceton, no problems in a well ventalated area. Works real nice. I like to clean before I scuff with the red pads, then I clean after the scuff. I used the 988 on small parts I like how hard the two part industrial wash primer is, so I use it exclusively now. It takes some time for set up and clean up but not bad. I also don't think it is as heavey as the 988, the 988 is thicker, it sort of fills inperfections. The other reason I like the wash primer is it is transparent, I want to see when cracks start.
Cheers