GG is absolutely great - but not cheap!
There are a couple of other companies now marketing the generic at about 30-40% cheaper.
Appears to work just as good as GG.
Do NOT buy a big bottle to get the savings of bulk if you can't use most of it within 1-2 months, for if a duffus forgets the LID sometime, the saving turns into real hard cash!
(But if you really WANTED a brown slug of plastic...)