new plaster quartz agr, brush with nylon or stainless steel brush?

Thank, i picked up another brush today.

I posted this on another thread of mine when i was going through pump selection but maybe it's better suited here.

My kids snuck and walked on the steps with dirty feet before water was filled over them. There's dirt stains on them that i can't seem to brush out. Think this may be permanent
or will it maybe go away when i start chlorinating? Pretty sure the dirt organic they were running around where i had a mess while i was hooking up the equipment.
 
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