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.

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Description

🧼 Elevate your shine game with the OG Big Red Sponge—because your ride deserves the best!

BUILT TO LAST REUSE - Easily rinses clean and dries fast—ready for countless detailing sessions without losing performance.
PROUDLY MADE IN THE USA - Crafted with premium materials ensuring top-tier quality and supporting local manufacturing.
DIRT TRAPPING INNOVATION - Dual-sided cross-cut channels pull grime away while protecting your paint from marring.
UNMATCHED CLEANING POWER - Original Big Red Sponge offers 10+ sq in more surface area than competitors for faster washes.
MAXIMIZED SOLUTION ABSORPTION - Advanced porous foam holds more cleaning fluid so you cover larger areas without constant reloading.

The Optimum Big Red Sponge is a professional-grade, reusable car wash sponge featuring a patented cross-cut design that traps dirt while minimizing paint marring. With over 10 square inches more surface area than competitors and advanced porous foam for superior solution absorption, it enables efficient, safe, and thorough cleaning. Proudly made in the USA, this durable sponge is perfect for automotive, RV, motorcycle, and boat detailing, delivering pro-level results every time.

Specifications

Brand	Optimum Polymer Technologies, Inc.
Material	Foam
Recommended Uses For Product	Automotive Surfaces
Surface Recommendation	Automotive Surfaces
Color	Red
Special Feature	Reduced Marring, Reusable
Item Package Quantity	1
Included Components	Optimum Big Red Sponge
Product Dimensions	7"L x 5"W x 3"Th
Model Name	Big Red Sponge
Item Weight	0.02 Pounds
Number of Items	1
Global Trade Identification Number	00812779022516
Manufacturer	OPT
UPC	647409554002 812779023193 812779022516
Item Weight	0.24 ounces
Item model number	22516
Is Discontinued By Manufacturer	No
Manufacturer Part Number	22516
Special Features	Reduced Marring, Reusable

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