BCRider

Those stains you had and the fact that the BB sort of cleared itself up suggests that you got water into the BB and it may well be rusty in there. This would require a strip down to assess the situation and either a clean and lube or replacement depending on the findings.

In the future when you wash your bike if you use a garden hose to rinse it do not set the spray to "blast" away the dirt or anything else. A strong jet of water can easily blow water in past the dust seals and contaminate the bearings behind the seals. Use the garden hose with a light "rain" style spray that is no more harsh than what you would expect to use on a delicate garden plant.

If you ride your bikes a lot then you should learn to at least do a few of the more simple jobs on your own. Cleaning and oiling the chain is one such thing and you'll find lots of info around here on other factors such as putting a film of grease on the seatposts to avoid corrosion jamming them into the seat tube of the frame.

And ditto on what Danno said about the tires. Other than the cheaper tires can have big wobbles in them even when they are just fine and when new. The cheaper tires just do not get made with the same sort of care as the more expensive ones. So for some tires you can expect a bit of runout on the tread face. But as already mentioned it is rare that folks can feel it unless you're doing warp factor 4 down a hill of some sort.

Loose spokes in a wheel can create some funky feelings in the bars or saddle as well. Just for the heck of it go around the two wheels and use a screwdriver turned around and tap the handle on all the spokes and see if they at least all have a musical sort of note to them instead of just sounding dull and "thunky". If you have more than one or two that are "thunky" sounding then the wheel may be suffering from very bad spoke tensions and they may look decent enough when you spin the wheel when not loaded but under load they may be doing some very odd things.