for some, the tub leans forward during wash, it comes from the torque during agitation, some do it, some don't...totally normal, doesn't affect anything else, and the tub always centers for the spin.....
I put extra foam padding attached to the front panel just to keep it centered at all times, but that's me.....
there should be a clip inside the machine to guide the drain hose from the pump to the outlet, but these are just clipped in place, not fully tightened down type of clamps, so a little rattle can be had from sitting in the wrong awkward position....
there were times on machines, the pressure hose would also rattle against the outter cabinet is it happen to set too close, especially during spin...
sometimes we would just use some duct tape or wire ties to secure things tighter....
a simple loose screw will make that rear control panel rattle like crazy.....annoying yes, but doesn't really hurt anything...
Vinegar has been used for years without complaints....it can clear up suds, and rinses away with no odor.....usually about 2 ounces in the dispenser is enough....its not like your pickling your clothes....but there is a recipe somewhere about bread and butter pickles soaking in your washer....hey, people have done stranger things....
