I’ve been using a small empty smuckers jelly jar filled with white vinegar. It’s smaller than a traditional mason jar and holds about 6 ouces of vinegar. Punched holes in the cap with an icepick and turned it upside down in the tank. works great. Quick oven cleaning tip is to put about a cup of ammonia in a small bowl and put it in a cold oven for 24 to 48 hours. Then you can just wipe away the gunk buildup with a damp sponge. Single guy here and I hate to clean so any tips that reduce the amount of work involved is paramount for me. Yeah…..this stuff really works.