Sony kf-60we610 purple haze problem

The only thing I can think of is some kind of dirt or smear of something on one of the parts in the light engine. How far did you take it apart?
A photo of the tv with a white screen and a black screen might help narrow it down.

Explain further please: "replaced the blue LCD screen and polarizer with a green set".
What exactly did you remove from the donor and put in the patient?

In Sony's 3-LCD sets the three LCD panels are monochromatic, calling them 'the red LCD panel', etc, is not technically correct but we tend to all do it. Better to call them 'the LCD panel in the blue path' etc.

For this reason you can replace the (usually bad) LCD panel in the blue path with one from the green or red path from another set as you have done.

This is NOT true for the polarizers. (BTW, I assume you meant the input polarizers which are changeable, the output polarizers are glued to the prism block underneath the LCD panel and should never be messed with.) The green path input polarizer can't substitute for the blues. You should look at the blue path input polarizers for both donor and patient and use whichever looks the best. On these sets the blue path input polarizers don't tend to burn up too badly. I've never seen one personally that was not somewhat reusable. On some other manufacturers' sets they fry and curl up like a strip of bacon.

If you put the green path input polarizer into the blue path, the filter built into it will admit mostly green as it was designed to do, and since there's no green there, only blue, your set will likely end up with not enough blue. Try to get the blue path input polarizer back exactly as it was, because if you look closely at its mount, you will see it looks like a saddle, and as you slide it from side to side on the slot, you are actually rotating it a few degrees. This is a factory alignment. Look for marks from the old mounting screw.

This does not however explain the odd symptoms that you have, smear and blob.

You should never dry-wipe any optics. Blow off with canned air, then wipe gently with a qtip wet with alcohol, and dry quickly with a dry qtip. The best alcohol is people quality ethanol, 180 proof, which you can buy in little bottles at the liquor store. Failing that look for 93% isopropryl in the drugstore.