A dishwasher leak can come from the door, loading that redirects spray, excess suds, hoses, or internal components. Where and when the water appears helps separate the causes.
If it leaks at the door, check loading and suds
Tall items can redirect spray toward the seal. The wrong detergent or too much detergent can create suds that push water past the door.
Clean the gasket without damaging it
Remove grease and debris with a compatible cleaning method. A torn, distorted, or poorly contacting gasket needs replacement rather than more cleaner.
Water underneath may come from connections
The inlet line, drain hose, pump, and internal joints can leak. If diagnosis requires removing panels or disturbing water and electrical connections, stop DIY troubleshooting.
Stop using the machine during a significant active leak
Dry the floor only when safe and disconnect power from a dry location when appropriate. Water near electrical connections requires extra caution.