It's very likely with that age of Tessar, that it is age bloom rather than haze as such. You'll want to be very cautious - if it is bloom, you do not want to remove it. Instead, be aware of where the sun is, use your hood and appreciate what you have for what it is. It will never be a modern lens, after all.
The Helios-103 being a modern lens is a different story - a modern design, coated double gauss is going to give a different vibe than the old "Eagle's Eye" will. Both have their place.