I put mine up by £1 on certain jobs,after a few on the customers said "why haven't you put your price's up? we wouldn't mind paying ££(they gave me the price )"
so I sketched up a notice, informing ,as from your next clean the price for my service will be £xx.
This way the had time to accept the rise and wasn't just put on them.
Got me thinking need to review all my price's.