Most people wait until their windows look like a fogged-up bathroom mirror before they start looking for a cleaner. That's a mistake. Here's what I've learned from hiring and firing these guys over the years.
Red Flags in Quotes
If a quote comes back as a round number like $100 or $200, run. Real quotes are based on window count, floor height, and how filthy they are. A flat number with no breakdown means they're guessing and probably padding the price. Watch for quotes that are way lower than everyone else. That's either a rookie who will break something or a guy who'll skip half the windows. Also, anyone who quotes over the phone without seeing the house is lying. They'll show up and tack on fees.
Red Flags in Communication
If they can't answer a simple question like "how do you handle water spots?" with a clear answer, you're dealing with an amateur. Vague replies like "we do a good job" mean nothing. Someone who dodges your texts or calls back three days later isn't going to show up on time. This is a scheduling business. If they're sloppy before you even pay them, imagine how sloppy they'll be on the job. Bonus red flag: they ask for payment before the work is done.
Red Flags in Contracts
A one-page invoice with no fine print is fine. A contract that's five pages long is hiding something. Look for clauses that say you're responsible for damage caused by their equipment. That's their problem, not yours. If they demand a deposit over 25% of the total, walk. Most reputable guys don't ask for a dime until they're finished. Also, if they won't put their license and insurance info in writing, you're hiring a liability.
How to Protect Yourself
Ask for proof of insurance before they set foot on your property. Call the insurance company to verify coverage. Do a quick internet search of their business name plus the word "complaint." Read the bad reviews, not the five-star ones. Take before photos of your windows inside and out. If they break a seal or scratch the glass, you have evidence. Pay by credit card, not cash or check. That gives you a chargeback option if they screw you over.
Compare local window cleaning options on RatingsNearMe to find someone who actually shows up and does the job right.