Make it yourself
A: Not all hair-spray formulas respond to the same cleaning methods. You may have to try a few to find the right one. Test each method first in an inconspicuous area to be sure it won’t damage paint.
Use thick gloves and lopping shears to remove dead, weak and conflicting canes of rose bushes. On hybrid teas, keep about half a dozen canes (or fewer, if that’s all that are alive) around an open center and cut them back to about 18 inches, just above an outward-facing bud. Remove any suckering canes emerging from the soil.
Shrub roses can be rounded off at a foot or so high. If a Knockout rose is healthy, it can be pruned to 6 to 12 inches high.