Cons

Because of the high expense of high-quality eco-friendly supplies and equipment, as well as the extra time the contractor spends at your home ensuring no roots or stains are left behind, this procedure may cost a little more.

Pick a professional roof cleaner that assures that the roof stains will be entirely removed before they leave your home when employing a contractor who utilizes this procedure. Also, seek a provider that provides roof stain prevention programs every year.

Chlorine-Bleach Mixture

Contractors that use Sodium Hypochlorite (chlorine-bleach) combine it with other chemicals like Trisodium Phosphate, or TSP, in quite high proportions. They spray it on your roof and wait for it to dry before proceeding. They apply the mixture multiple times till the spots go away. Normally, no rinsing is required. The stains that don’t come out may (or may not) be washed away by rain.

Pros

Bleach cleaning is frequently less expensive due to the low cost of the chemicals and the fact that the roof is usually not washed after application.

Cons

The final findings are rarely instantaneous. Furthermore, a chlorine-bleach solution has the potential to damage humans and animals. It’s also a potent oxidizer, capable of dismantling most protein structures, including the plant cuticles found in the landscaping around most houses. Plants, trees, grass, and shrubs may be permanently damaged by the impact of such a combination on your environment. In watershed regions, bleach and phosphates can leak into streams.

High-Pressure Power Washing

In an attempt to remove roof stains, some roof cleaners utilize high-pressure power washing.

Pros

There aren’t any that I can think of. High pressure shouldn’t be used for cleaning a roof.

Cons

Not only will this harm your shingles, but it will also fail to eradicate the organisms that create roof stains. Because power washing shingles with high pressure leave root systems behind, algae will frequently reappear fast.