Oh please, so you're saying all your relays are dust free?
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For a start Most relays ARE now sealed and I have never heard about self cleaning contacts on a relay and if you are paying to have the contacts cleaned (wiped) on a modern relay you are getting ripped off.
On the old school relays they had a set of contacts not unlike a set of ignition points and these Did benefit a clean periodically But we are in the 21st century and these types of older style relays only exist on cars 6+ decades old.
You mob wire up the way you want to it doesn't matter to me, Just make sure you fire extinguisher is handy[bigwhistle]