Tried most Gardiners brushes over the years and even the first brushes (Vikan) Andrew McCann delivered with the first gen trolleys. They all worked.
Currently using 35cm Superlite sill with 2x1.4mm jets outside and 2x100 deg fans middle..why? Just trying something different .... the only thing that gives me the most confidence is flow.
*on uk style double glazed glass I use 35cm Superlite (non sill) with 2x1.4mm jets outside and 2x100 deg. Most glazed units here are wooden and have deep frames so sill brushes work best and prevent frame damage.
Over the years I have tried many 'colouring in patterns' and tbh most have worked...having a 'structure' I find helps as from time to time I find I get into a 'loop' where I end up doing the same bit of glass.
Run a 45cm brush (soft) for solar panels....again plenty of flow.
Think the best brush is the one your used to with plenty of flow, just replace with bigger lighter and a little more flow
