I flushed mine out with lots of water and it didn't get all the mouse nesting out. I ended up pulling the engine and trans and replace the clutch, it was in bad shape when I got it apart and the throw-out bearing rusted to the transmission input snout, clutch was frozen mid throw.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy