Not reading disk

Hi,
I had a similar problem with my Yamaha DVD player which just kept displaying "reading, reading and reading"- eject-no disc or disc error. I took it into be repaired and was told it needed a new optical lense-cost $120.00 plus fitting.I was told not viable to fix. Not convinced I had a look on the internet and a suggestion given was to buy a can of Air Spray from **** Smith,$14.00 later and blowing the proverbial out of the inside of the unit-Bingo it works for about an hour and then, away we go again-reading reading reading - eject-no disc. Back to the internet and i found a DVD technician who advised the more often than not the problem is a dirty optical lense, and he has saved 100's from the grave by the following method. The most effective way to clean it is with a cotton wool bud soaked in Isopropyl Alcohol and give it a good rub without damaging it. I got the Isopropyl alcohol for $12.00 a 250 ml bottle from the local chemist and did what was suggested. IT WORKED and is still going- not sure for how long but the bonus is I can use the remainder for rubbing down my tired old body, as after shave or a refresher, in addition to fixing DVD's so not all is lost. It's worth a try considering I was going to throw the Yamaha away. Thanks to the internet and the good people who share their knowledge I am happy again.
Hopefully it will work for you. If not, don't forget the other uses for the alcohol.