Is it normal after soldering pipes to have debris in the lines? The debris is greenish in color. I had a buddy solder a new Kohler valve on in my guest bathroom and debris is coming out of my master bathroom shower and clogging the shower head. I had to take it off to clean it out about three times. Also, the hot water in my master bathroom sink has slowed substantially since the soldering and I suspect it is clogged with debris.....not sure how to resolve this.

Thanks,
Doug