A Google search for "cleaning brake system with denatured alcohol
" turned up some promising results.
It looks like denatured alcohol will not harm rubber seals and will cut the crud from the DOT 4&5 mix. D.A also dries without residue.
Other than the HD dealer, AutoZone is the only place that carries DOT 5 in my area (Las Vegas). So tonight I'll start the process.
1). Remove as much of the fluid from the reservouir as I can.
2). Disconnect the brake line banjo from the caliper
3). With compressed air, blow out the lines from master cylinder to banjo
4). With the banjo disconnected & bleeder opened, blow out the caliper
5). Reconnect everything
6). Run denatured alchohol through the system to flush out the crap
7). When running clean, one more shot of air through the system to ensure it's dry
8). Refill & bleed
I'll be sure to use tubing and a collection device to keep the crap from blowing everywhere.
Instead of filling from the master cylinder backwards I'll try the syringe method of filling through the bleeder forward. From what I've read and seen, it will virtually eliminate the air from the line as it's pushing the air out through the master cylinder.