When I recommended reptile spray it was intended as a preventative measure (mites were suspected but none had been found yet). I feel that PAM is too dangerous to use as a preventative measure but once mites have been confirmed it is time to pull out the big guns and wipe them all out as quickly as possible.
As a preventative measure reptile spray works good enough and poses very little risk to the animal, but PAM is the best choice if there are mites crawling all over your snake. (just follow the directions to the letter)