detail shop
a pro clean once a year will do wonders
dirt gets in the most unlikely places,
it's a mobile machine!

You need better hose attachments or a more flexible hose. Perhaps you
could find a spare hose to modify for car work.
I still remember in the 50's when car washes were on about every
corner. Mainly they used whisk brooms to clean the floors, including
those with carpets. They did an amazingly thorough job without vacuums.
I'm not suggesting you revert to the stone age.