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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Optimum Big Red Sponge – The Original Made in USA Crosscut Rinseless Sponge - Safe for All Paint Types, Use for No Rinse Vehicle Wash and Car Wash Soap

Product ID: 57957169

Details

Brand
Optimum Inc.
Color
Red
Included Components
Big Red Car
Item Package Quantity
1
Material
Foam
Model Name
Big Red Sponge

🌀Cross-cut design traps dirt, reduces marring

🔴Original USA-made Big Red Sponge

🧽10+ sq in extra surface area

235.46 DT

Duties & taxes included

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧼 Wash smarter, not harder — detail like a pro with the original Big Red Sponge!

DURABLE REUSABLE - Easily rinses clean and ready for countless washes
UNMATCHED SURFACE AREA - 10+ square inches more cleaning power than imitators
PROUDLY MADE IN THE USA - Top-quality craftsmanship you can trust every time
MAXIMUM SOLUTION ABSORPTION - Advanced porous foam holds more wash solution for faster detailing
REVOLUTIONARY CROSS CUT CHANNELS - Deep dirt-trapping design protects your paint finish

The Optimum Big Red Sponge is a premium, USA-made car wash tool featuring a unique cross-cut foam 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 retention, it enables efficient, safe rinseless or traditional washes. Durable and reusable, it’s the go-to sponge for automotive enthusiasts who demand professional results every time.

Specifications

ASIN	B078DPCYFV
Best Sellers Rank	#160,035 in Automotive ( See Top 100 in Automotive ) #156 in Car Washing Sponges & Mitts
Brand Name	Optimum Polymer Technologies, Inc.
Color	Red
Customer Reviews	4.6 4.6 out of 5 stars (1,385)
Global Trade Identification Number	00812779022516
Included Components	Big Red Car Wash Sponge
Item Dimensions L x W x Thickness	7"L x 5"W x 3"Th
Item Type Name	Optimum Red Big Sponge
Item Weight	9.07 g
Manufacturer	OPT
Manufacturer Warranty Description	Contact manufacturer.
Material Type	Foam
Model Name	Big Red Sponge
Number of Items	1
Other Special Features of the Product	Reduced Marring, Reusable
Package Quantity	1
Recommended Uses For Product	Automotive Surfaces
Surface Recommendation	Automotive Surfaces
UPC	647409554002 812779023193 812779022516
Unit Count	1 Count

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