There's nothing western politicians can do to fix working conditions in China.
Embargo them? The working conditions in China won't get any better, and you'll simply put a lot of Chinese out of work by doing that.
Higher tariffs? That's just a tax on importing goods for China. While it helps the domestic manufacturing sector, it still does nothing to fix the working conditions in China.
Consumers suddenly start caring? The same as the "higher tariffs" scenario.
Any other ideas?