Full analysis
Evita debuffs are per bullet, not per attack cycle. As such, she can apply 5 stacks in one attack. The debuffs are multiplicative.
The cleanse removes all stacks of a single buff, priority as follows:
DMG> Eva >Acc > RoF > Mov > Armor > AP
Damage reduction buffs and HP Shields (the two buffs that would be most useful to remove if you can only remove one) are not included.
The 10% Damage buff requires a buff to be removed to be applied.