i just did a test with the new batch of CLR,the one marked "eco friendly". the borescope said it was not good at removing the carbon deep in the grooves. re cleaned with the homemade concoction of Bon Ami cleaning powder mixed with Hoppes #9 and a bit of Mercury Outboard Quicksilver Power tune, way better job at deep carbon removal. i am done with CLR
Swadiver,
I'm going to have to try your home brew. Sounds promising...