Managed to clean the mirror on my Sony Kp44. Procedure took less than hour and is very easy. Remove decorative bottom cover just pulls off sharply from each end. Remove the speaker grill cover that holds the power button etc ( 5 screws) this cover needs to be tilted at the bottom and pulled downwards. Now go round the back of the set and start removing the screws that hold the outer bezel with the SONY emblem on it leave the middle on on to aid removal. Go to the front of the set and remove the last remaining five screws that hold the the bottom of the bezel. Now get someone to hold the front bexel on whilst you remove the middle screw from the back. The bezel will now come forward. You will find that the slack on the sensors for auto convergencence will be taped up. Remove tape and disconnect connector and cable clamp for auto convergence wire. The front bezel and lenses can now be moved some distance from the set and start cleaning. Once mirror is cleaned and CRT lenses put the bezel back on and whilst the front covers are off remove the rear bottom one and do the mechanical focus followed by electrical. Electrical focus pots are behind the black hardboard cover at the front of the set below the speakers.
Best of luck
Best of luck