Just drove around on my Perl-ed Weathertech, not slippery at all, also it was not allot of Perl, then wiped with MF. Slick is not an issue.
If it had been a closer reach, I might have tried a little M40.
Main point IMO, is a special cleaner/protectant, Weathertec spray(s), seems like a one trick pony (only for weatertech mats), when so many other items, use the same material. Or will one vinyl cleaner work on two different vinyl items?
Jarred767 +1 - the specialized product from the mat co is not necessary.