Get some BioBuzz 100% biodegradable bar oil. Next time the newbie forgets to tighten the oil cap and oil spills all over the flagstone ($$$), just pour water on it and walk away. No second trip to the site, no replacing expensive stone, concrete, pavers, grass, whatever. No polluting the lake that collects water from the hill on which the trees are planted, nothing but awesome customer relations. The BioBuzz becomes less expensive when you weigh these factors...