just dont leave it in. if you put it in the oil, change the oil, if you put it in your gas tank, burn all the gas back up and fill it up.
seafoam (kerosene) eats rubber, so you dont wanna leave it in for long.
I seafoamed my m52b28, i was happy with the results.
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff