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ronn · 04-15-2017, 07:24 PM

PS I just noticed that the vinegar I bought at Costco is only 5% acid. Its not working very well.

5% is normal for vinegar

I left it for 6 weeks in my 12 Buick radiator and it did a marvelous job! cleaned it out good.

Patience is a virtue.

04-15-2017, 07:24 PM	#20
ronn Senior Member Join Date: Feb 2011 Location: NNNNNNNNJJJJJJJJJJ Posts: 7,645	Re: Block cleaning PS I just noticed that the vinegar I bought at Costco is only 5% acid. Its not working very well. 5% is normal for vinegar I left it for 6 weeks in my 12 Buick radiator and it did a marvelous job! cleaned it out good. Patience is a virtue.