i allways used to
the same reasons as kenaltobelli
though mainly it was just to break the customers into the WFP idea, after i changed a well established trad round into WFP, WFP was all about safety for me, not earning more money, i did that for over 5 years and it worked well
i have since got a tank for the van ( thus i can carry more water ) i allways used to do all the conservs with WFP aswell, the customer loves the idea of the frames being done, last year i changed to ALL WFP, am i any faster, not much, does the customer mind, some have said they prefere it done trad ( for these i have said, give it a few cleans and if you still want it trad, then i will ) as it really makes no difference to me
ref what do i used, i use PURE WATER with GG3, it works well, and when you decide if your going to do WFP down aswell, just wipe over the frames the clean before