Bosch maxx classic washing machine doesn't clean clothes

There are a lot of things to consider when trying to solve this problem. Obviously a front loader washes differently than a top loader. Top loaders tend to using a washing motion that is good for stains but wear out your clothes fast. Front loaders typically use less water and wash more gently, but in some ways still do better than top loaders. Anyway, think about any other variables that go into the laundry equation. Consider the distance the machine is from your water heater. This machine will use MUCH less water to fill than your old one, and, you know how when you turn a faucet on hot it takes a minute for the hot water to actually get there? It's the same way with your machine. If there's a sink next your washer, you should always turn on the hot water on the faucet until it gets hot right before you start the machine. The same goes for dishwashers. If there's not a sink close you can easily turn up the temperature for all hot water on your water heater, although that will use more energy.
Consider what detergent you're using. If you're using high efficiency detergent (like Tide he) maybe you should switch to your old brand. If you're using your old brand of detergent, try getting a high efficiency detergent.