Nope, I'm talking about riding fairly high end gravel bikes on Southeast Michigan (US) dirt roads on which the surface has been treated with a chloride spray which acts as a binder and water repellent for the road surface. The treatment keeps light rain from saturating the road surface, which keeps the road nice for longer.
If it's been wet enough for the surface to get soft and sloppy, once this flings up on a bike it dries hard. This material requires a solid soaking on the bike to get it to soften before it can be cleaned off, and it also is highly corrosive to metal due to the salt content. (Unless it's had time to soak in water runs off of it.) So it takes a fair bit of time and effort, and it's pretty much required that, you get it off of all metal parts including chain, cassette, rotors, bolts, etc. Depending on the ride I've also had to pull the fork because enough has flung up into the lower headset bearing that it'll be problematic if left alone.
By design it doesn't just rinse off, so time and a lot of water and a brush with soap (typically dish soap) and a rag is needed to get it clean and back to a sane state. And sometimes disassembly.
If it's been wet enough for the surface to get soft and sloppy, once this flings up on a bike it dries hard. This material requires a solid soaking on the bike to get it to soften before it can be cleaned off, and it also is highly corrosive to metal due to the salt content. (Unless it's had time to soak in water runs off of it.) So it takes a fair bit of time and effort, and it's pretty much required that, you get it off of all metal parts including chain, cassette, rotors, bolts, etc. Depending on the ride I've also had to pull the fork because enough has flung up into the lower headset bearing that it'll be problematic if left alone.
By design it doesn't just rinse off, so time and a lot of water and a brush with soap (typically dish soap) and a rag is needed to get it clean and back to a sane state. And sometimes disassembly.