I bought a new 3 series in 2016, which had diamond cut alloys. I coated them with KKD Revolve, and I had absolutely no white worm when I sold it after just over 5 years later.
Once coated, I only ever had to wash with shampoo. Once a year I removed them for a 'deep clean' and top up of the ceramic if necessary, but I found the KKD remained very effective up until around the 3 year mark.
I wouldn't worry too much - I have had mine on my S3 since 2017 and done 60k miles. Yes there is some corrosion and "white worm" but it is inevitable. Ceramic coating or regular wheel sealant will help as well as decent cleaning and no acid cleaner.
My Mercs wheels are diamond cut and it's nearly 5 years old now. @big_pete coated them around 4 years ago and they're still perfect.... Really easy to clean too. I believe he used Gtechniq C5 wheel armour but I stand to be corrected on that.
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