Ok mate, first of all I know exactly how you feel.
Me and my girlfriend fought a constant war against cockroaches when we had an apartment in Cambodia...
The ************* out in Asia have wings and can fly, making them about 5 times as freaky. Seriously, me and my girlfriend still have nightmares!
Unfortunately for us, Cambodia was too poor for services such as Exterminators, so we had to fight them alone.
The internet is a good source of information. First, you should indentify which spieces you are dealing with; For us it was obvious that it was the Asian spieces because they are the only ones that fly and we were living in the middle of South East Asia!
But the ones in Europe are usually the German Cockroaches or American Cockroaches.
It's important you find out which species you are dealing with because they all have different habits; Like some are active during night and avoid light and some are active only in the day.
Once you have that sussed out, it makes planning a strategy easier.
You could of course call in an exterminator, but cockroaches are one of the hardiest living speices in the known universe! He will use chemicals and this will get rid of them temporarily but will most likely explain that it's going to be an ongoing battle...
Basically you have to start following some rules around your home;
Chemical sprays are only part of the solution, first you have to cut off there food supply:
Follow these rules to the letter:
- Do not leave your washing up laying around. You will have to start cleaning your dishes as soon as you finish your meal.
- Always clean up crumbs or spillages on the floor or any surfaces immediately.
- Start sealing food packages properly and ideally store them in containers; Things like breakfast cereals, bread and so forth.
- Do not leave your rubbish bins open. This is a big no no, this really attracts the roaches. Ideally buy bins with lids and put a plastic bin inside. When full always empty them immediately.
- Storing your rubbish correctly outside is also incredibly important. If your roaches are coming from outside then this is one of the most important factors. Make sure everything is double sealed and placed in hard plastic bins with lids that seal shut...try and keep the rubbish as far away from yoiur house a spossible, especially away from doors (roaches can come under doors, we had massive problems with this in Cambodia).
- Repair any dripping taps or plumbing; Roaches can survive weeks or months without food as long as they have a water source. Very important you get rid of any pools of water.
Once you have cut off all there food sources by following the above, THEN it's time to go on a search and destroy mission...This is when you get some pay back for the nightmares they have caused you and your family!
You'll be amazed at what tiny holes and crevices the roaches can squeeze into; They can shrink there body to about 1/6 of it's normal size and get into the tiniest gaps.
We found out where the nest was in our apartment; It was behind the toilet where there were tiny gaps in the tiles.
Your best weapon in filing up these holes is 'silicone gel'. It's cheap and you can get it from any DIY store. It only takes a day to set rock hard and it remains water proof. This cuts off and starves out any baby roaches who hide in these gaps.
Go all around the house looking for gaps; any potential tunnels, entry/exit points no matter how tiny the hole or gap looks...Seal it off.
Try and follow a roach as it runs away; See where they go.
Chemical sprays are efficient, but they can adapt very quickly and develop immunities; Don't hesitate to squash it. I know it leaves a horrific green slime and they can drop eggs, but if you clean it up staright away with bleach, hardcore disinfectant, it's one less roach that will breed and cause problems.
Obviously keep all surfaces sparkling clean. Mop floors daily (preferably twice a day). Vacuum carpets daily (initially try to do it twice a day) and wash bed lining regularly. If they are coming in undernath doors, perhaps make something from wood that seals the gaps at bottom of the doors when they are shut and at night time.
Strictly following all the above for only a week drastically eliminated the number of roaches in our property; They no longer had nests in our apartment and all we had to contend with was them coming in from the outside under our door (we had mosquito nets over all windows). The geckos did the rest (roaches have a few natural predators) for us
I wish you the very best of luck! I know they can literately ruin your life when an infestation sets in, but just a couple of days of big effort; military style planning and buying the right tools and executing the plan, you will get on top of the problem, maybe even eliminate the problem entirely.
And remember most kicthens in the UK actually have roaches. They are almost impossible to eliminate entirely in commercial kitchens... It doesn't mean you live in a dirty house (you can live in a spotless mansion and still have a cockroach infestation if you aren't storing things right), and actually roaches are harmless despite then looking like something out of the Alien films!
Good luck!