Grunge Off - Zep, Simple Green?

[bassplayer]

I read somewhere that Zep Citrus Cleaner is the same thing as Grunge Off, only it's about ten times less expensive if you buy a gallon ($12), I've also heard that Simple Green is the same as Grunge Off. I like Grunge Off but I don't like the price - has anyone here tried Zep or compared Simple Green to Grunge Off?

 

[Tweak]

I use the generic Mean Green. I just couldn't stand the smell of Simple Green. They use the same active ingredient - 2‐butoxyethanol.

I didn't do any side-by-side comparison but MG is strong enough to remove the label from my GB-187.

Works so well for me I bought a 1 gallon container for only $5, should last me quite a while.