Tangential: If the toilet paper shortage during the pan wasn't enough to wake Americans up to the need for bidets, nothing will. We're savages over here.
There's always residue. You're just diluting it by wiping repeatedly. Before I was a bidet convert, I was a very thorough wiper. Now that I've experienced both, I know there's never enough dry wiping.
Wait, rather than a quick squirt on your ass. You instead fill an entire bathtub so you can drag your shit-covered ass in there and soak in your own feces?