Do you have roots? Are you growing DWC? If so yes I would dump water clean reservoir and add a little nutrients then check ph, then check ppm makes sure it's not too high . Don't know what water you are using ?
Command strips the little bitty ones. They will work for a little while and I use either hemp twine or cotton yarn . Some use wire . But wire can cut into the stems
I'd try hydroguard too it's got good bugs. They need good bacteria to grow. Specially if you're using bleach or anything that kills all the bugs. But it's a preference:)