Ultra-low pricing ("$99 for whole home cleaning") is a red flag. Professional cleaning across the industry typically runs $25-75 per room because of labor, equipment maintenance, training, and insurance. Suspiciously low prices indicate inexperienced cleaners, poor equipment, or "bait-and-switch" tactics (low initial quote followed by up-charges). Quality professional cleaning costs money, if it seems too cheap, expect poor results or damage.
High pricing isn't a guarantee of quality, but rock-bottom pricing is almost a guarantee of problems. Compare quotes from 2-3 professional companies. Prices should be within 20 percent range; outliers (much higher or lower) are suspicious. Ask what the quote includes: travel fees, protectant costs, deodorizers, and extended drying time should all be clear upfront.