Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
When we unpacked the deflated ball from its plastic bag, it was covered with grease.  Not sure if this was some kind of melting of the plastic (oil product) because it was stored in the plastic bag too long?  I washed it in dish soap to the best of my ability before we inflated it, but it was still sticky.  After we inflated the ball, I used window cleaner and the 2-step cleaning process seemed to work.  Otherwise, the ball is great, inflated it to the max size, let it sit 24 hours as recommended, and it hadn't expanded, so it was stable.  We are using it happily now that it's cleaned up.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: B: positive