From CrushBrush.net website: Send train is leaving, don’t let a greasy hold keep you from getting on! Our brushes use a new patent pending bristle that cleans the chalk and debris off those holds like nobody’s business. Crush brush is specifically designed for cleaning plastic climbing holds. Don’t waste your time and money on boar’s hair bristles, or other plastic brushes. Like a fine wine, this brush gets better over time. As the brush gets used the bristles volume increases, with even more brushing power. We tested all kinds of materials in order to come up with this new brush. Once you use it you’ll think it’s the greatest thing since sliced bread (or that new pair of climbing shoes you’ve been saving for). It’s THAT good. We have a hand held brush and a momma crush brush that’s meant to be pole mounted.
- (brush purchased from Amazon June 2021) - (Amazon website says brush was first being sold June 2018)