excessive dirtiness in the pc and in the cpu cabinet can be so much disastrous. This thread is an excellent example of that. Moreover I have heard of some cases where a dirty pc which was cleaned for years and was run, got a data loss problem too. its hard drive ports got stuck which dirt and finally after 7 years one day the data was not not accessible. The was taken for data recovery services. And this crap has happened to me. I took my hard drive to Stellar data recovery and finally the data was with me. Thanks to Stellar. And thanks for this thread.
I heard and even seen the rats, mice or spiders in uncleaned for long time PC's. I think it's fine place to hide, such PC. Warm, dark, even cosily. Ideal place for living for small animals. :]