I moved into an apartment in Hanoi a year ago. It was brand new and I am the first occupant.
A maid comes 3 times a week (Mon/Wed/Fri) to service the place, cleans, does the washing & ironing and tidies up.
In the corner of the bathroom there is a floor drain and - yes you've guessed it - it's the cockroach front door.
When I got back there last Friday evening after work, I witnessed one of them scurrying off down the drain.
Out came the Cockroach spray and a liberal dose went down the drain after it.
5 minutes later the little critter was on his back on top of the drain cover - legs wriggling.
It died a few minutes later - I thought.
I left it there all day Saturday and Sunday (to make a point to the maid on Monday - today - that she should spray the place maybe once a week as a precaution).
I stayed in all day yesterday working on an assignment on my own - sulking on the occasion of Spurs being dumped out of the CL

Before I went to bed last night it was still reposed on the drain cover - looking decidedly demised.

Woke up this morning and IT WAS GONE.
So - are these bloody things as indestructible as they say they are?
I guess so.