I've recently acquired a new customer who needs a pond cleaned for spring. In the past my duties of landscaping don't go much past mulching. I mainly just mow, trim, blow, and mulch. Any advice on how to clean a pond and what the best way is to get the stuff out from the bottom and all that. I assume I will likely need to change the wonder out somehow. also, this is just a small garden pond. thank you in advance.