Cleaning Fake Stone

I have a question about cleaning Fake stone leading into housing developments. The caps on the pillars are like a hard plastic even. What is the best way to clean these? I was thinking a strong soft wash technique and a soft brush. I really don't want to use a pressure washer right now.. Thanks for any suggestions..
 
Sounds like your on the right track, that's how I would approach it but can't say I've ever done anything like that, I'm sure someone else will chime in.
 
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