I know you can, but don't know quite how much to use. Take a standard dose of clen, figure out how much it would take to get that out of 4 pumps of Napalm (or however many pumps you use), then do the math for the total volume. I don't quite know how much stuff you can add to Napalm. It's pretty loaded down already.
I'll be getting some LipoBurn and add 5g Formestane and possibly some clen to it. There's quite a bit of room for whatever you want in it.