redbug
Fish Fanatic
you can use CLR to clean the glass it should do the trick... it is a bit harsh but works great. be sure to flush the tank after using it
I have used the stuff (CLR) on many tanks over the years with out any issues. but like I said i flush the tank very well before i add fishwow, that stuff certainly sounds powerful.. do we know if its safe for fish later?
LOL sorry this isnt any help but I laughed when I saw the word "Crud". Haven't heard that since I was in Juniour school about 20 years ago!