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air duster spray can and if you are talking inside as software download iobit advance system care 6

you buying a new PC & want to make clean from inside the cabinet then My suggestion is don't do that because there is warranty seal is available on the cabinet if try to open himself then warranty goes void.

any electrical equipment attract the dust you can't stop that so if you want to clean from service centre or after 4 or 5 months, not need daily basis.

there is also one fan which use for in-taking the cool air from outside to inside. some time small particles of dust will goes inside with it.

for more help consult with the people from whom you are buying PC they will may be guide you

Try covering the air paths with cheese cloth or that black stuff that is kind of like honeycomb that act as filters. You have to make certain that air flow and cooling happens at the same time.

You should be able to get dust fliters. Idk. Check your air filter for your air condition to reduce dust and vaccum your room often and dust other pieces of furniture. This should help reduce the amount of dust in your room