Useful Products is a US-based small business established in 2007 by car wash owner, electrician, and former bodybuilder Anthony LaPolla that specializes in drill-cleaning brushes and attachments.
Yellow is the “all-purpose” medium bristle, but some are softer and harder depending on what types of surfaces you’re cleaning (but none of them will scratch!).
I came across this drill attachment set, and let me tell you, it helped me tremendously!
I still had to get in with a putty knife on some of them but it really cut down my elbow-grease time.
If it wasn’t for this drill attachment, I think my arms would have just fallen off trying to clean it as good as I did!

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