Owning a family car means accepting that the cabin takes a beating. Between winter road salt, crushed snacks, and everyday commutes, keeping it clean adds an extra maintenance cost on top of gas and oil changes. Booking midweek during early spring is your best bet, since shops run post-winter promos to fill quiet bays after the cold months.
A thorough detail and interior steam cleaning typically runs around $350. You do not need to drop all that cash at once, though. Separating your price negotiation from how you pay lets you lock in a discount first, then split the bill over time without paying interest.
Keep in mind that 0% interest is a strict deadline, not free money. If you still carry a balance when the 18 months end, regular variable APR kicks in on whatever is left. Stick to your $19.44 monthly payments so the balance hits zero well before the window shuts.