The answer to 'how to maintain maid service' is to establish a regular cleaning schedule, provide clear instructions, and communicate openly with your maid service. This will help ensure your home is cleaned to your satisfaction on a consistent basis.
Start by creating a cleaning checklist that outlines your expectations and the frequency for each task, such as dusting, vacuuming, mopping, and cleaning bathrooms. Provide this list to your maid service so they understand your preferences. It's also helpful to do a walkthrough with the maid when they first start to ensure they know where supplies are kept and any special instructions.