Neem Oil. What kind of soap?

what kind of dish soap should i mix with the neem oil. or does it matter?

Any kind will do, but organic / bio degradable is preferred.

Dawn, or safer brand. Some soaps have chemicals that are not good for the plant. The best is to use Cocowet or equivalent. If you have no store that sells these I would recommend as plain as you can get dawn. Hope this helps. 1drop/gal

Yes dawn as noted by emerald above or palmolive the both make phosphate free soaps that are bio degradable. If your dealing with spider mites neem oil will only contain the problem and you'll need to keep a close eye. Only way i've ever gotten rid of the mites was to but the plants outside in 8c ( sorry don't know f ) weather and that killed most then neem oil before sun down with another night of 8c and that killed em all.