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Keeping paving clean and slip free

We have a set of shallow steps down to the house from the private road next to which we live. They are pretty much old pieces of granite in different degrees of dressing. Some rough, some polished. There are a couple of flagstones too. Given how wet our place is they get wet. The flagstones grow some form of lichen/green stuff which is immensely slippy when it's wet, which it pretty much is all winter. We also have a wee bit of laid concrete, and I've just had the sideways on bricks lifted and replaces with cobbles, because NOTHING I could do made them safe.

I'm trying to grow ground hugging plants between the flags. So far it's mostly chamomile and thyme, but I have many more ideas for next year.

 

Does anyone know how I can keep the stones clean? Or what I should clean them with. I was using Dettoly water this afternoon, but I kept having to rescue worms, and I'm a bit worried about the plants.