Kopuk, charge what you think you are worth (within reason). i e if you complete an inspection survey on every job and prevac etc plus you have full insurance and training then i my opinion you are worth more than the geezer down the pub thats on the dole and lends a george and a bex bissell from his mother in law to earn some beer money on a weekend. Another way to look at it is to charge what you NEED to i.e, work out your oveheads and find out how much you need to earn to survive + make some profit, i work out my average job value every now and again this i a good way of working out what you need to charge as you can calculate a Price PSM needed from the average amount you are cleaning per job and how many jobs you do a month.
Hope this helps.