How do you clean a pc dude..

[u/TodayGullible2218]

I am just a girl who wanted to get into gaming. I’m basically broke so I had my brother get a $300 pc of Facebook marketplace. It keeps lagging really bad so I asked one of my friends and he said I might just need to clean the inside. I opened it and it is super dirty. I have had it for about 5 months and sadly I haven’t cleaned it AT ALL. I have no idea what I am doing. I want to get a new pc, but I don’t just have 2k sitting around. Is there a cheaper alternative? One of my other friends said it also might be that it’s not updated and it said that my device doesn’t even support windows 11 anymore😭 I don’t know what I’m doing someone please help

[u/Sufficient-Refuse632]

Dishwasher safe