What is another name for spick and span?

Formal:

* Immaculate

* Pristine

* Spotless

* Impeccable

* Flawless

* Shining

Informal:

* Squeaky clean

* Tip-top

* In apple-pie order

* Shipshape

* Polished

The best synonym for "spick and span" will depend on the specific context and desired tone.