no sure but its a softer sponge so i would say not high density

Is there a particular way to wash this? Mine has black stains on it. Can I machine wash it?

To get rid of black stains on the Big Red Sponge, spray some Optimum Power Clean on it, rub it in lightly, then rinse it out thoroughly, you can also use Optimum FerreX on the sponge, spray it on, let it sit for a minute, then rinse it out thoroughly. The FerreX will break down any contamination in the sponge and restore it. Store the sponge in a bucket of fresh ONR at 256:1 or .5oz of ONR per gallon of water, put an air tight lid on it and you're good to go.

Is it safe to use with 1 bucket only?

Yes. That's how it was intended to be used. Keep a grit guard or two in your bucket. Having said that, I would have two buckets, each with their own sponge. One for wheels and one for paint. I was using one bucket but it gets dirty after a few washes. Remember to apply the minimum amount of pressure on the sponge. Just enough to maneuver around the car. I can do my whole car in about 30 mins. You also need to know how to dry your car and a good high gsm drying towel.

Manufacturer	OPT
Brand	Optimum Polymer Technologies, Inc.
Product Dimensions	17.78 x 12.7 x 7.62 cm; 6.8 g
Item model number	22516
Manufacturer Part Number	22516
Special Features	Reduced Marring, Reusable
Item Weight	6.8 g

Optimum Polymer Technologies, Inc.Opt 22516 Optimum Big Red Sponge, 1 Pack

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