Here's my comment taken from another thread on what to Soap on:

Dude, you can literally grind almost anything:

-Lunch tables in school
-Ledges
-Rails
-Pipes coming out of the floor from construction
-Stairs
-Car bumpers
Tree roots (yes, you can grind those)
-Garbage (not garbage bags, like when theres a pile of wood and metal or old tables)

Dude, if its sticking out of the floor, try grinding it. Thats what i say. and thats the way i look at things.

I mean geez, i grind my bed frame. I even grinded the side of my tub because my mom told me the floor was all bleached and i didnt wanna ruin my shoes, so what did i do? Run from the door, backside the tub, and get to the window. (i needed to close the window)

Like before, anything you see sticking out of the floor, thats plastic, metal, wood, anything (not rubber), just rub your plate on it. If you can grind it, fuck it....go for it

shit was funny. Prabas too (big impact plate)

Soaps can last a long time my friend. I wouldnt really recommend grindind curbs unless there painted. Oh, and welcome to the team. ;/