Understood. The poly is covering the wood surface. I like the wax on mine. I like the UV protection also. I have made some of the older REO's with the poly coat shine by using the wax. None of the finishes show they have been harmed in any way by the Howard's wax.
Everyone can use their own judgement and decide. Robert did say a damp cloth would be fine for cleaning.
Glad you posted this. Experience goes a long way. I'll be putting Howards Sun on mine for the very same reason; UV protection. The Howard's doesn't have any of the petroleum "solvents" that other waxes have so shouldn't, in theory, affect the poly coating. And, of course, Howard's inside. I didn't get DH's Redwood Mini waxed inside and beveled edges of door done soon enough and his juice did darken the edges of door. I couldn't get it away from him for over a month!!!!!! I got mine waxed pretty quickly and it doesn't have any staining. I'm not so worried about staining inside but they do need the wax to keep bare wood fed and protected from moisture. Both of the Figured Redwood Mini Woodvils needed a little sanding of edges of doors after a penetration of orange oil. I practiced on DH's and over did it a little by taking a little too much off and I didn't do it on a perfectly flat surface with extremely fine sandpaper that was needed. He didn't care as it is not that noticeable. His main priority is function and comfort.
Hugs, Alice