Cleaned a commercial building that had one of those big black rubber mats by the front door. It was black underneath, which is kind of expected. I tried my HW mix, dwell, surface cleaner. No difference. I tried Hot water, nothing. I tried a turbo nozzle, nothing. I tried (sorry can’t remember which one it was) HD britenol or one restore, let dwell briefly, rinse, a very minor change. Tried same stuff again (it was already in the pump up) soaked the area, waited about 5 minutes or so, rinsed pretty good but not perfect. Tried one more app with no real difference. I figured it isn’t black anymore and I don’t want to ruin the remaining concrete, so let it rest. Funny thing is they must always put the same huge mat in the same place every time, it was the whitest part of the concrete, with some weird rust coloring at the edges.
What do you use? It almost looked like rubber had fused with the surface or was ground into it.
Most commercial they’re cleaner underneath the mat. Hopefully you rinsed off back of mat. I’ve seen them that have been there a long time almost fused to the concrete though. Hot water with good degreaser usually will take care of.
Thanks. Yes, the front and back side of the mat was rinsed prior to replacing. I did some spot treatments for rusty marks on their entryway too. Couldn’t do the whole thing like f9 says to (blending) due to constant traffic.
Not this mat, because it was newer, but I am guessing the last mat was probably stuck to the concrete and they had a hard time getting it off. There were chunks of mat attached to the concrete (underneath the current mat). The chunks came off pretty easy, it was the remainder of the mat fusion I was having issues with. I don’t a lot of commercial work, but the mats are always black underneath. Never ran into one like this.
