Why does it always charge your credit card double what it says on the screen? I have used it twice now and both times I was charged double what the screen says it charges! They should have signs that say that it will charge double what it tells you!

I don't think it will charge you double but will hold the amount for a day. It is setup for the manual wash system too. So before you get really charged it puts a hold on say $5, then refunds it. But it can take a day. It is setup for the manual wash and it puts the charge/hold on, then you wash and then release the hold and charge $2.75 because that is all you used.

I've never been charged double when using the automatic car wash.