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Phil, the question was originally asked by tcd223 on page 1, but I would like to know the answer as well.
"Have you stopped using P21S all together in favor of Sonax?"
I haven't used either extensively, 2 bottles of P21S and I just bought Sonax and used once, but I feel like I use a less amount of cleaner with the P21S. I need to use my whole bottle of Sonax first to make final judgement though.
Funny thing about Sonax is I was able to convince a friend that it was the most gruesome road kill he's evet seen...
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