“Some kind of haze” is separation in lens elements and does not clean out. It’s a defect that is there to stay.
The Rollei tele is prone to separation unfortunately. Many of them suffer from it.
I once had a Tele that I bought from a prize winning Dutch photographer and felt the need to sell it. The fellow here that. Ought it had it taken apart by his ‘technician’ since it had a slight spot where focusing was less smooth. It was a perfectly fine camera but somehow once it was ‘repaired’ all kinds of defects suddenly ‘revealed’.
Moral of the story, keep them away from incompetent repairmen.