Trying to identify this reservoir

[Mk1putt]

First time posting . . . Have an Aria 3901 and while we were finally able to get out of Michigan winter, I noticed a fluid leak in the small compartment to left of the inverter/solar panel control . . . What is this? Also appears that there’s an opening on top?

Had the motorhomem dewinterized at Camping World on the way down.

Thanks for any thoughts

[m1noel]

Power steering hydraulic fluid.

[The Gritz Carlton]

It's "blinker fluid". If you leave the turn signals on too long it will use it all up.

[Rgmarino]

That’s the power steering fluid