Well, I dunno if it is better than the
RotoRooter stuff but I was just floored by this new stuff:
I bought it for my tub, but then said to myself "hmmmmm, I wonder"
You remember those blue chips that had color bleed practically glazed on them that was impossible to get off?
I was so desperate I used 0000 steel wool on them (which is way too rough for softer chips).
old LINK
Dip, toothbrush /rinse:

Poor light but you get the idea.
I was busting my *ss on these even with the steel wool and still had not finished 200 of the 650 I bought.
I was shuffling these paulsons for weeks (after and before)

(be careful of rubbing the hotstamp too much)
$4.99 for 24oz
I'm going to try a soak a little later.