I bought my 2005 Landover new. Shortly thereafter I started using Sonax on my discs. 15 years later I still use Sonax. I never had to rub or clean windows. And after 180 uses (15 years), discs look like new. However, Sonax is not cheap. One bottle on 19" discs is enough to clean all discs 2-3 times. But for me the extra effort is worth the sacrifice of hand washing.
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