Aj: Apple bloom, this is not the way to clear Sweetie bot!  
Apple bloom: Then how?  
Aj: You only a bucket of water and soap and not forget a brush and to washing her like this(she clear sweetie bot)  
Apple bloom: But why she can’t a bath?  
AJ: Her body can’t deal with too many water on her and is make feel totally weird!  
Sweetie bot bell: I can’t wait for my next upgrade who Twilight work on right with the Robotect company to make my new body Frame to protect me from water…is bad for my mind and all the weapons in me!  
Aj: ..I don’t know most of all this technology gyzmo ..is more hard for compare to magic, i can get it more on magic but this is way over my head but i do know you will use those advance weapons to protect everypony right!* clink one eye to her*  
Sweetie Bot belle: Of course, those weapons are not toys, those are like the party canon of Pinkie pie..i still don’t get it how she turn a canon who are normal deadly to a harmless weapon????she really confused and is over her programing  
Aj: Don’t try to understanding Pinkie logic or you will go insane!  
Sweetie bot belle: Ok….well what i like of my robotic body is i can eat…well not like my first one…oh i can’t wait for my new body frame!  
Rarity: You have wait, is take time and money to make it and not forget is will be tested too, you don’t want he don’t work, do you?  
Sweetie bot belle: No!  
Rarity: Good and be a dear help me to take all those foods back home!  
Aj: Ok you are all clear!  
Sweetie bot belle: Thanks Applejack, I coming Big sister unite…darn it…i hate talk like this, i work so hard to not do!  
Rarity: I think is the side effect of take you bath!  
Sweetie Bot belle: You..think..i am a MiniMuM Confuse..GRaa Again, I maybe a robot pony but don’t want talk like this outside my battle mode…I hope my new body don’t have those problem!she angry  
Rarity: Yeah, Let go home!  
Sweetie bot belle: Ok!

Damn, when did she get those improvements?

But the water makes me feel funny…

“Uh, Apple Bloom, do you remember what Cheerilee told us about robots?”
 
“Not to let them know they are robots or they might go into a homicidal rage?”
 
“Yeah, that….”
 
“What are you two talking about? I just don’t like baths because they make me feel strange! Stop it!”

“Rarity’s gonna kill you if the soap damages my battery!”

“Go go Gadget Hooves!”

The obvious solution is to polish her as though she were a fine vehicle.
 
Or just scrub her vigorously with a sponge instead of dumping her straight into a tub of water.

Wait, when did Scootaloo’s mane get so long?

“NO! Stop! I don’t know if I’m water proof!!”