The Vikan brush, although it holds onto a lot of 'bits', is the best brush out there, in our opinion.
Using the Gaz (monofilament) brush has proven to have many defects.
Wash the brush everyday in warm water + W/Up liquid, rinse, then rinse again in pure water and you cant go wrong.
For guttering and cladding, etc, you're best off using the Vikan.