So I picked up a nasty (but freeeeee) 36 gallon tank from craigslist the other day. The tank had obviously not been cleaned and had anything at all done to it for at least 6 months maybe longer. However, all the equipment was still running. It had a huge pleco in it!! There are some kinda gunk and deposits on everthing. The filter, the glass, everything. What are some products that have worked well for you guys to clean to crap out of the this thing? (literally) Thanks for the advice.