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Depends on how long your drain line is and where the stoppage is. You could rent a drain snake from a hardware store but if you don't know how to operate one I would suggest you call a plumber or roto rooter man (look in the yellow pages).
The person is a steel-worker.
If Orbeez go down the drain, do not flush water down the drain, as this can cause them to expand and block the pipes. Instead, try to retrieve the Orbeez using a drain snake or a vacuum with a hose attachment. If they are already causing a blockage, you may need to call a plumber to safely remove them. To prevent future incidents, avoid disposing of Orbeez in sinks or toilets.
hydrologist
A janitor or maid
A neat freak!
Safai wala.
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I think it is window cleaner.
A person who cleans a vacuum is typically referred to as a vacuum cleaner technician or a vacuum cleaner service professional.
a janitor.
If the person was female, she would be called a maid.
Detailer may be the one you're thinking of.
Generically a "domestic aid" For a female a "chambermaid" For a male a "houseman"
Manhole
A person who works at a dry cleaning establishment is typically called a dry cleaner or a dry cleaning specialist.