I know tons of people use simple green/grunge off to clean their pieces, but I've never really seen how exactly people use it. Just fill the tube up and let it sit for a few days then rinse? I've also heard you can reuse it. Just strain it out and its good to go again?
No need to let it sit for days unless your glass is disgusting. Even when I consider mine disgusting it only takes a few hours soaking. I fill it up, soak, then dump it right back into the jug to re-use. Once it turns from green to black I buy a new jug.