I have had a pair of LaBella Deep Talkin' Flats on my Corvette Fretless since February. Being the only bass I use at gigs and for practice, the strings have seen their fair share of action. Today as I applied beeswax to the finish, I decided to give the strings a good clean. First, I took them off the bass. I put some fast fret on a paper towel and vigorously rubbed each string, moving back and forth, taking about 3 minutes to scrub down each string. After wiping down the fingerboard with lemon oil, I put the strings back on. They sounded brand new, like they needed some breaking in. I was shocked at how well it worked. No more of that grimy feeling every time I play. I'm looking forward to another 8 months of service from these guys. Anyone else here have much success with Fast Fret?