jmkelly
rangefinder user
Raid - plus 1 from me. This lens can do so much more than yours is doing.It's a piece of history. The defects are not. Send it to John / Focalpoint.
Since Don sent it back in the current state, I doubt the problem is easily-cleaned haze on the surface of any of the elements. Cleaning marks & coating damage, or haze between cemented elements are more likely.
1) FocalPoint could repair all of these issues, though the price will be more than the lens cost or is worth. But maybe it would be worth it to you.
2) Brian posted a DIY front element repair on a badly damaged collapsible Summicron using a 3M polishig cloth and an eyeglass repair kit (where did you get that cloth and kit from, Brian?). Maybe you could attempt this.
3) Or you could start buying and selling Summarits on eBay until you find one with less damage.
BTW - I had a really good example of the M Summarit (1957), that I traded away because I have a 1958 Summilux that I like just that little bit better. So 4) you might consider a very early type 1 Summilux as an alternative.