Dishwasher safe? Well:
The life span of the bottles depends decisively on the way they are used and cleaned. Hand cleaning is recommended, as the material loses its functionality after only 80 dishwasher cycles. Unfortunately, such a bottle purchase is neither sustainable nor harmless.

I have had the bottle for a few months and wash it in the dishwasher. However, I would recommend a rough rinse, because due to the shape of the bottle, oat flakes sometimes stick to it.